WHY THE DSTV MULTICHOICE UNIT ONLY ACTS STRANGELY AFTER YEARS OF SUBSCRIPTION?

We bought the explorer without insurance and the unit is changing the channels by itself. when we consult multichoice,they claim we don't have insurance.I see that as the way for multichoice to force take our money out of our pockets by force.Since they have the ability to switch off the decoders when one hasn't paid the monthly premium,what then stops them from fiddling with it to force us all as consumers to take these products back to them so that they get the money by any means possible? National consumer council must intervene and stop them from forcing us to give them money by force.We paying monthly premiums for the repeated programs and now want to force us all to not only pay for the subscriptions but the ************ charges they are wholly responsible for. We never experienced any problem in the first years and now that they realized that we consistently paying and consumed based on the amount of years have with them,they using these trick as the way to further get money from all of us knowing that we can't turn back and there's no competition in their monopoly.Our government must stand up against these day light *******